Take a pass over all the bundled nodejs sources. Pull down a recent v18 revision and see about updating them all to that version.

Our test coverage is pretty good so we should catch any mistakes. And I've beefed up the diffing conveniences to make it easier to merge our changes / node's changes.

For more performant filesystem access, consider:

• use process.binding('fs') for more performant stat and package.json reading
• use fs.statSync('', {throwIfNoEntry: false}) to avoid creating garbage

Should sync our error construction logic with node's
https://github.com/nodejs/node/blob/06dd8c31fd7e736f1d0e57d8ae4a41227661bbc3/lib/internal/errors.js#L347-L381